When the Kosmos/Tullow/ Anadarko group made the Mahogany and Hyedua discoveries offshore Ghana last summer, the transform margin that stretches from Benin to Sierra Leone became a more prospective region for West African explorers. After appraisal, the discoveries were confirmed as both belonging to the same large Santonian fan, now christened the Jubilee field. There are several untested features neighboring the field, which lies in water depths between 3,280 and 6,560 ft (1,000 and 2,000 m). Ghana celebrated its 50th anniversary of independence with the discovery — the largest in offshore Africa for sometime.